Readonly properties

src/Context/CashContext.php

@@ -21,7 +21,7 @@ final class CashContext implements Context
      *
      * For example, step 5 on CHF would allow CHF 0.00, CHF 0.05, CHF 0.10, etc.
      */
-    private int $step;
+    private readonly int $step;
 
     /**
      * @param int $step The cash rounding step, in minor units. Must be a multiple of 2 and/or 5.

src/Context/CustomContext.php

@@ -18,14 +18,14 @@ final class CustomContext implements Context
     /**
      * The scale of the monies using this context.
      */
-    private int $scale;
+    private readonly int $scale;
 
     /**
      * An optional cash rounding step. Must be a multiple of 2 and/or 5.
      *
      * For example, scale=4 and step=5 would allow amounts of 0.0000, 0.0005, 0.0010, etc.
      */
-    private int $step;
+    private readonly int $step;
 
     /**
      * @param int $scale The scale of the monies using this context.

src/Currency.php

@@ -20,7 +20,7 @@ final class Currency implements Stringable, JsonSerializable
      * For non ISO currencies no constraints are defined, but the code must be unique across an application, and must
      * not conflict with ISO currency codes.
      */
-    private string $currencyCode;
+    private readonly string $currencyCode;
 
     /**
      * The numeric currency code.
@@ -33,23 +33,23 @@ final class Currency implements Stringable, JsonSerializable
      *
      * The numeric code can be useful when storing monies in a database.
      */
-    private int $numericCode;
+    private readonly int $numericCode;
 
     /**
      * The name of the currency.
      *
      * For ISO currencies this will be the official English name of the currency.
      * For non ISO currencies no constraints are defined.
      */
-    private string $name;
+    private readonly string $name;
 
     /**
      * The default number of fraction digits (typical scale) used with this currency.
      *
      * For example, the default number of fraction digits for the Euro is 2, while for the Japanese Yen it is 0.
      * This cannot be a negative number.
      */
-    private int $defaultFractionDigits;
+    private readonly int $defaultFractionDigits;
 
     /**
      * Class constructor.

src/CurrencyConverter.php

@@ -19,7 +19,7 @@ final class CurrencyConverter
     /**
      * The exchange rate provider.
      */
-    private ExchangeRateProvider $exchangeRateProvider;
+    private readonly ExchangeRateProvider $exchangeRateProvider;
 
     /**
      * @param ExchangeRateProvider $exchangeRateProvider The exchange rate provider.

src/Exception/CurrencyConversionException.php

@@ -9,9 +9,9 @@
  */
 class CurrencyConversionException extends MoneyException
 {
-    private string $sourceCurrencyCode;
+    private readonly string $sourceCurrencyCode;
 
-    private string $targetCurrencyCode;
+    private readonly string $targetCurrencyCode;
 
     /**
      * CurrencyConversionException constructor.

src/ExchangeRateProvider/BaseCurrencyProvider.php

@@ -23,12 +23,12 @@ final class BaseCurrencyProvider implements ExchangeRateProvider
     /**
      * The provider for rates relative to the base currency.
      */
-    private ExchangeRateProvider $provider;
+    private readonly ExchangeRateProvider $provider;
 
     /**
      * The code of the currency all the exchanges rates are based on.
      */
-    private string $baseCurrencyCode;
+    private readonly string $baseCurrencyCode;
 
     /**
      * @param ExchangeRateProvider $provider         The provider for rates relative to the base currency.

src/ExchangeRateProvider/CachedProvider.php

@@ -15,7 +15,7 @@ final class CachedProvider implements ExchangeRateProvider
     /**
      * The underlying exchange rate provider.
      */
-    private ExchangeRateProvider $provider;
+    private readonly ExchangeRateProvider $provider;
 
     /**
      * The cached exchange rates.

src/ExchangeRateProvider/PDOProvider.php

@@ -16,17 +16,17 @@ final class PDOProvider implements ExchangeRateProvider
     /**
      * The SELECT statement.
      */
-    private \PDOStatement $statement;
+    private readonly \PDOStatement $statement;
 
     /**
      * The source currency code if fixed, or null if dynamic.
      */
-    private ?string $sourceCurrencyCode = null;
+    private readonly ?string $sourceCurrencyCode;
 
     /**
      * The target currency code if fixed, or null if dynamic.
      */
-    private ?string $targetCurrencyCode = null;
+    private readonly ?string $targetCurrencyCode;
 
     /**
      * Extra parameters set dynamically to resolve the query placeholders.
@@ -47,18 +47,24 @@ public function __construct(\PDO $pdo, PDOProviderConfiguration $configuration)
             $conditions[] = sprintf('(%s)', $configuration->whereConditions);
         }
 
+        $sourceCurrencyCode = null;
+        $targetCurrencyCode = null;
+
         if ($configuration->sourceCurrencyCode !== null) {
-            $this->sourceCurrencyCode = $configuration->sourceCurrencyCode;
+            $sourceCurrencyCode = $configuration->sourceCurrencyCode;
         } elseif ($configuration->sourceCurrencyColumnName !== null) {
             $conditions[] = sprintf('%s = ?', $configuration->sourceCurrencyColumnName);
         }
 
         if ($configuration->targetCurrencyCode !== null) {
-            $this->targetCurrencyCode = $configuration->targetCurrencyCode;
+            $targetCurrencyCode = $configuration->targetCurrencyCode;
         } elseif ($configuration->targetCurrencyColumnName !== null) {
             $conditions[] = sprintf('%s = ?', $configuration->targetCurrencyColumnName);
         }
 
+        $this->sourceCurrencyCode = $sourceCurrencyCode;
+        $this->targetCurrencyCode = $targetCurrencyCode;
+
         $conditions = implode(' AND ' , $conditions);
 
         $query = sprintf(

src/ISOCurrencyProvider.php

@@ -18,7 +18,7 @@ final class ISOCurrencyProvider
      *
      * @psalm-var array<string, array{string, int, string, int}>
      */
-    private array $currencyData;
+    private readonly array $currencyData;
 
     /**
      * An associative array of currency numeric code to currency code.

src/Money.php

@@ -36,17 +36,17 @@ final class Money extends AbstractMoney
     /**
      * The amount.
      */
-    private BigDecimal $amount;
+    private readonly BigDecimal $amount;
 
     /**
      * The currency.
      */
-    private Currency $currency;
+    private readonly Currency $currency;
 
     /**
      * The context that defines the capability of this Money.
      */
-    private Context $context;
+    private readonly Context $context;
 
     /**
      * @param BigDecimal $amount

src/MoneyComparator.php

@@ -21,7 +21,7 @@ final class MoneyComparator
     /**
      * The exchange rate provider.
      */
-    private ExchangeRateProvider $exchangeRateProvider;
+    private readonly ExchangeRateProvider $exchangeRateProvider;
 
     /**
      * Class constructor.

src/RationalMoney.php

@@ -18,9 +18,9 @@
  */
 final class RationalMoney extends AbstractMoney
 {
-    private BigRational $amount;
+    private readonly BigRational $amount;
 
-    private Currency $currency;
+    private readonly Currency $currency;
 
     /**
      * Class constructor.